Ultrasound imaging technology based method for detecting flow pattern of gas-liquid two-phase flow in micro channel

Abstract

The invention discloses an ultrasound imaging technology based method for detecting flow pattern of a gas-liquid two-phase flow in a micro channel. The method comprises the following steps: tracer particles are spread in the fluid to be detected in the micro channel, and an ultrasonic probe is arranged on the outer side of the micro channel; ultrasonic equipment generates an excitation signal to trigger all ultrasound unit arrays of the ultrasonic probe to transmit ultrasonic row by row in a measurement area of the micro channel to be detected, and the ultrasonic probe receives scattering RF signals in the micro channel to be detected; the radio frequency signals are converted into RF data; the RF data is extracted to generate a particle image in gray model, and the flow pattern of gas-liquid two-phase flow in the micro channel is obtained through the particle image. Compared with the prior art, the invention adopts linear array ultrasonic probe for scanning the flow field to be detected column by column, and the ultrasound resolution is much higher than that of other forms of ultrasonic probes. The signals received by the ultrasound probe is processed, and the particle image in gray model is generated, so as to obtain the flow pattern of gas-liquid two-phase flow in the micro channel; and flow pattern in the micro channel can be detected more comprehensively.

Description

technical field [0001] The invention relates to a flow pattern detection method applied to gas-liquid two-phase flow in a microchannel. Background technique [0002] Gas-liquid two-phase flow exists widely in nature and industrial production processes such as power, chemical industry, and nuclear energy. The gas-liquid two-phase flow will form different flow patterns under the influence of factors such as pressure and flow rate, and the flow pattern has a great influence on the flow characteristics and heat and mass transfer characteristics of the gas-liquid two-phase flow. According to the appearance shape and phase distribution characteristics, the flow pattern of gas-liquid two-phase flow can be divided into bubbly flow, plug flow, slug flow and annular flow. [0003] With the rapid development of micro-processing technology, industrial equipment is gradually showing a trend of miniaturization. The gas-liquid two-phase flow system in microchannels widely appears in indu...

AI Technical Summary

Problems solved by technology

The gas-liquid two-phase flow system in microchannels widely appears in industrial production and people's daily life. With the decrease of the inner diameter of the channel, the flow characteristics of gas-liquid two-phase flow in microchannels are different from those of conventional pipeline two-phase flow. Large difference, which makes the detection method of the flow pattern in the conventional pipeline not well used for the detection of the flow pattern of the gas-liquid two-phase flow in the microchannel

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